package Chapter14_TypeInformation;

import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.util.regex.Pattern;

/**
 * Date: 2019/3/5
 * Time: 10:25
 * User: Driss.
 *
 * 14.6.1 类方法提取器
 *
 * 使用反射展示一个类的所有方法，即使这个方法是定义在基类中
 */
public class ShowMethods {

    private static String usage = "usage:\n" +
            "ShowMethods qualified.class.name\n" +
            "To show all methods in class or: \n" +
            "ShowMethods qualified.class.name word\n" +
            "To search for methods involving 'word'";

    private static Pattern p = Pattern.compile("\\w+\\.");

    public static void main(String[] args) {
        if(args.length < 1){
            System.out.println(usage);
            System.exit(0);
        }

        int lines = 0;
        try{

            Class<?> aClass = Class.forName(args[0]);
            Method[] methods = aClass.getMethods();
            Constructor<?>[] constructors = aClass.getConstructors();

            if(args.length == 1){
                for (Method method : methods) {
                    System.out.print(p.matcher(method.toString()).replaceAll(""));
                }

                for (Constructor<?> constructor : constructors) {
                    System.out.print(p.matcher(constructor.toString()).replaceAll(""));
                }

                lines = methods.length + constructors.length;
            }else{
                for (Method method : methods) {
                    if(method.toString().indexOf(args[1]) != -1){
                        System.out.print(p.matcher(method.toString()).replaceAll(""));
                        lines++;
                    }
                }

                for (Constructor<?> constructor : constructors) {
                    if(constructor.toString().indexOf(args[1]) != -1){
                        System.out.print(p.matcher(constructor.toString()).replaceAll(""));
                        lines++;
                    }
                }
            }
        }catch (ClassNotFoundException e){
            System.out.println("No such class: " + e);
        }
    }
}
